Steel material, and steel material manufacturing method
A manufacturing method, steel technology, applied in the field of steel, and steel manufacturing, can solve the problem that the SSC resistance cannot be obtained stably, and achieve the effect of excellent SSC resistance
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[0196] 180 kg of molten steel having the chemical composition shown in Table 1 was produced.
[0197] [Table 1]
[0198]
[0199] An ingot was produced using the above molten steel. The ingot was hot-rolled to produce a steel plate with a plate thickness of 20 mm.
[0200] The hot-rolled steel plates of each steel number were naturally cooled so that the temperature of the steel plate was normal temperature (25° C.).
[0201] After natural cooling, the steel plates of each test number were reheated to the quenching temperature (920° C. for the austenite single-phase domain) and soaked for 20 minutes. After soaking, the steel plate was dipped in a water tank and quenched. At this time, the cooling rate during quenching (CR 800-500 ) is 400°C / min. For Test No. 23, after soaking at the quenching temperature, cooling was performed by immersion in an oil bath. At this time, the average cooling rate between 800°C and 500°C was 40°C / min.
[0202] After quenc...
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